6more than the difference of b and 5

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

Which of these tools or constructions is used to inscribe a hexagon inside a circle?